Valero Energy Corp. (VLO) on Wednesday reported an operational disruption and above-normal gas emissions at its refinery in Port Arthur, Texas.
In a statement to the Texas Commission on Environmental Quality, the refinery said a "process unit upset" led to more than 500 pounds of sulfur dioxide emissions from a Sulfur Recovery Unit that began Tuesday afternoon and ended Wednesday morning.
"Operations personnel removed feed gas from the unit and worked to restore normal operations," the refinery said.
The 335,000 barrel-a-day refinery lies east of Houston.
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